CN110426853B - Lens and head-mounted display device - Google Patents
Lens and head-mounted display device Download PDFInfo
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- CN110426853B CN110426853B CN201910703281.XA CN201910703281A CN110426853B CN 110426853 B CN110426853 B CN 110426853B CN 201910703281 A CN201910703281 A CN 201910703281A CN 110426853 B CN110426853 B CN 110426853B
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Abstract
The application provides a head-mounted display device. Head-mounted display device includes mirror holder, lens and display module assembly. The lens and the display module are arranged on the mirror bracket. The lens includes a first portion and a second portion. The first portion is disposed adjacent to the second portion. The first portion is for transmitting ambient light. The second portion is for transmitting ambient light. The first part is also used for transmitting display light emitted by the display module. The ratio of the light transmittance of the second portion to the light transmittance of the first portion is within a threshold range. The threshold value ranges between 0.5 and 1.5. The quality of the picture displayed by the head-mounted display device is better.
Description
Technical Field
The application relates to the technical field of display, in particular to a lens and a head-mounted display device.
Background
Augmented reality (ar) is a method of applying virtual information to the real world so that a real environment and a virtual object appear in the same picture or the same space. With the continuous development of ar technology, users can visually see the pictures of the virtual objects superimposed in the real environment by using the head-mounted display device. Conventional head mounted display devices include lenses. The lens is a key component for transmitting display light and ambient light to the human eye. However, the structure of the lens of the head-mounted display device is not reasonable, so that the quality of the image displayed by the conventional head-mounted display device is poor, and the identification comfort of human eyes is affected.
Disclosure of Invention
The embodiment of the application provides a lens and a head-mounted display device. The quality of the picture presented by the head-mounted display device is to be improved.
In a first aspect, a head-mounted display device provided in an embodiment of the present application includes a frame, a lens, and a display module. The lens reaches the display module assembly all set up in the mirror holder. The lens includes a first portion and a second portion. The first portion is disposed adjacent to the second portion. It will be appreciated that the first portion is disposed adjacent to the second portion, the second portion being located at the periphery of the first portion. The first portion is for transmitting ambient light. The second part is used for transmitting the ambient light. The first part is also used for transmitting display light emitted by the display module. A ratio of the light transmittance of the second portion to the light transmittance of the first portion is within a threshold range. The threshold value ranges between 0.5 and 1.5.
In this embodiment, when the ratio of the light transmittance of the second portion to the light transmittance of the first portion is between 0.5 and 1.5, the light transmittance of the second portion is closer to the light transmittance of the first portion. At this time, when the user wears the head-mounted display device, the brightness of different areas of the lens is more uniform, so that the quality of the picture displayed by the head-mounted display device is better.
Further, since the light transmittance of the second portion is closer to that of the first portion, the user sees the real world luminance from the second portion the same as or similar to the real world luminance from the first portion. Therefore, when the eyes of the user rotate and the eyes of the user turn from the front view to the oblique view of the first part, the user does not feel uncomfortable due to large brightness difference of the received ambient light. The user experience of the head-mounted display device of the embodiment is better.
In one embodiment, the first portion includes a free-form surface prism, a semi-reflective and semi-transparent film, and a compensation mirror stacked in sequence. The semi-reflecting and semi-transparent film is arranged between the free-form surface prism and the compensating mirror. The free-form surface prism comprises a first light incident surface, a first light emergent surface and a second light incident surface. The first light incident surface is adjacent to the semi-reflecting and semi-permeable membrane. The first portion is for transmitting ambient light, and includes: the compensating mirror is used for receiving the ambient light, and the ambient light penetrates through the semi-reflecting and semi-transparent film, is incident from the first light incident surface of the free-form surface prism and penetrates through the first light emergent surface. The first part is also used for seeing through the demonstration light that the display module assembly sent, includes: the second light incident surface of the free-form surface prism is used for receiving the display light rays emitted by the display module, and the semi-reflecting and semi-transparent film is used for reflecting the display light rays received by the second light incident surface to the first light emergent surface.
In this embodiment, through set the first part to stack gradually the setting the free form surface prism half reflect and half penetrate the membrane and the compensating mirror, thereby utilize the free form surface prism half reflect and half penetrate the membrane and the compensating mirror will display light and ambient light that the display module assembly sent transmit to user's eyes, and then realize passing through wear-type display device watches the image that combines each other with virtual image in the real world, thereby improves wear-type display device's user experience nature.
In one embodiment, the second portion includes a lens and a transmittance reducing film. It will be appreciated that the antireflection film serves to reduce the transmittance of ambient light, thereby reducing the transmittance of the second portion. The lens comprises a first light inlet surface and a second light outlet surface which are arranged in a back-to-back mode. The transmittance reducing film is positioned between the first light inlet surface and the second light outlet surface. And the ambient light sequentially passes through the first light inlet surface and the antireflection film and then is emitted out through the second light outlet surface.
In this embodiment, the transmittance of the second portion is reduced by disposing the transmittance reducing film between the first light inlet surface and the second light outlet surface, and the transmittance of the second portion is similar to that of the first portion. At this time, when the user wears the head-mounted display device, the first portion and the second portion of the lens do not have a problem of large brightness difference, that is, the brightness of the real world seen by the user from the second portion is substantially the same as the brightness of the real world seen from the first portion. Therefore, when the eyes of the user rotate and the user turns to the oblique view from the front view to the second view, the user does not feel uncomfortable due to the large brightness difference of the received ambient light, and the user experience of the head-mounted display device of the embodiment is better.
In one embodiment, the edge of the permeability reducing membrane is connected to the edge of the transflective membrane. At this time, the ambient light entering the second portion through the first light inlet surface or the ambient light entering the first portion through the compensator can only pass through the transflective film or the transflective film once, that is, the ambient light cannot simultaneously pass through the transflective film and the transflective film, so that the brightness of the whole lens area is ensured to be relatively consistent, that is, the light transmission uniformity of the whole lens is relatively good, and thus, a user is ensured not to feel uncomfortable due to large brightness difference of the received ambient light.
In one embodiment, the first side of the first portion and the second side of the second portion are adjacent. The shape of the semi-reflecting and semi-permeable membrane positioned on the first side surface is a first shape. The shape of the permeability reducing membrane at the second side is a second shape. The first shape matches the second shape. It is understood that when the first shape is matched with the second shape, the transflective film and the permeability reducing film are connected with each other and are in face-to-face fit. At this time, the ambient light entering the second portion through the first light inlet surface or the ambient light entering the first portion through the compensator can only pass through the transflective film or the transflective film once, that is, the ambient light cannot simultaneously pass through the transflective film and the transflective film, so that the brightness of the whole lens area is ensured to be relatively consistent, that is, the light transmission uniformity of the whole lens is relatively good, and thus, a user is ensured not to feel uncomfortable due to large brightness difference of the received ambient light.
In one embodiment, the lens includes a first light-transmitting portion and a second light-transmitting portion disposed opposite to each other. The surface of the first light transmission part departing from the second light transmission part is a first light inlet surface. The surface of the second light transmission part departing from the first light transmission part is a second light emitting surface. The light-transmitting film is fixed between the first light-transmitting portion and the second light-transmitting portion.
In this embodiment, the lens is configured with the first light transmission portion and the second light transmission portion, so that the light-transmitting film is conveniently disposed in the lens, that is, the mounting process of the light-transmitting film is simplified.
In one embodiment, the light-transmitting film is a plating layer formed on a surface of the first light-transmitting portion facing the second light-transmitting portion or a surface of the second light-transmitting portion facing the first light-transmitting portion by a magnetron sputtering or evaporation process.
In this embodiment, the formation process of the permeation reduction film is simple and convenient to operate.
In one embodiment, the permeability reducing membrane comprises one or more of a semi-reflective and semi-permeable membrane, an absorbing membrane, or a polarizing membrane. At this time, since the cost of the transflective film, the absorption film, or the polarizing film is low, the cost of the formed lens is also low, that is, the cost of the head-mounted display device is also low.
In one embodiment, the compensation mirror has a third light incident surface. The third light incident surface deviates from the free-form surface prism, and the third light incident surface is smoothly connected with the first light incident surface.
In this embodiment, no abrupt protrusion or depression occurs at the connection between the first light inlet surface and the third light inlet surface of the compensation mirror, so that the first light inlet surface and the third light inlet surface of the lens are smooth, i.e., the lens has a more beautiful appearance. In addition, since no abrupt protrusion or depression is formed at the joint of the first light inlet surface and the third light inlet surface, the propagation direction of the ambient light entering the lens through the joint of the first light inlet surface and the third light inlet surface and the propagation direction of the ambient light passing through the first light inlet surface and the third light inlet surface do not change abruptly, so that when the eyes of a user rotate from the position of the first part to the position of the second part, the real world seen by the user does not change greatly or abruptly, and the user has better watching comfort.
In one embodiment, the second part comprises a substrate and a color masterbatch mixed within the substrate.
In this embodiment, the color master batch is disposed in the base material of the second part to reduce the light transmittance of the second part through the color master batch. At this time, when the eyes of the user rotate and the user turns from looking forward at the first portion to looking forward at the second portion, the user does not feel uncomfortable due to a large brightness difference of the received ambient light, so that the user experience of the head-mounted display device of the embodiment is better.
In addition, the preparation method of the second part is simple and easy to operate. In addition, the light transmittance of each area of the second part is uniform.
In one embodiment, the second portion includes a first body portion and a second body portion. The first main body part and the second main body part are respectively positioned on two sides of the first part.
In this embodiment, the second part is provided as the first main body part and the second main body part, so that the first part can be conveniently assembled on the second part.
In one embodiment, the second portion further includes a third main body portion disposed between the first main body portion and the second main body portion, and the third main body portion is disposed adjacent to the first light emitting surface of the first portion.
In this embodiment, the lens has greater integrity and greater structural strength. Further, the free-form surface prism is surrounded by the second portion, thereby preventing the free-form surface prism from being damaged. Furthermore, the manner in which the first part is mounted on the second part is also relatively simple.
In one embodiment, the second portion is a ring structure. The second portion has a receiving space. The first portion is disposed in the accommodating space.
In this embodiment, the second portion is configured as a ring structure, so that on one hand, the first portion and the second portion are convenient to assemble, and on the other hand, the connection area between the first portion and the second portion is large, so that the first portion and the second portion are more firmly connected, that is, the first portion is not easy to fall off from the second portion.
In addition, in some cases, for the first portion with a smaller partial optical index (e.g., the first portion with a smaller area of the exit pupil area (also called eyebox) or the first portion with a smaller field of view (fov)), the first portion is assembled on the second portion of the ring-shaped structure, so that the area of the first portion in each direction can be significantly increased, and thus the area of the lens can be significantly increased. At this time, the user has a wider viewing field and better viewing comfort.
In a second aspect, an embodiment of the present application provides a lens disposed on a head-mounted display device. The lens includes a first portion and a second portion. The first portion is disposed adjacent to the second portion. A ratio of the light transmittance of the second portion to the light transmittance of the first portion is within a threshold range. The threshold value ranges between 0.5 and 1.5. The first part comprises a free-form surface prism, a semi-reflecting and semi-transmitting film and a compensating mirror which are sequentially stacked. The semi-reflecting and semi-transparent film is arranged between the free-form surface prism and the compensating mirror. The free-form surface prism comprises a first light incident surface, a first light emergent surface and a second light incident surface. The first light incident surface is adjacent to the semi-reflecting and semi-permeable membrane. The compensating mirror is used for receiving the ambient light, and the ambient light penetrates through the semi-reflecting and semi-transparent film, is incident from the first light incident surface of the free-form surface prism and penetrates through the first light emergent surface. The second light incident surface of the free-form surface prism is used for receiving the display light rays emitted by the display module, and the semi-reflecting and semi-transparent film is used for reflecting the display light rays received by the second light incident surface to the first light emergent surface. The second part is used for transmitting the ambient light.
In this embodiment, since the light transmittance of the second portion is closer to that of the first portion, the brightness of the real world seen by the user from the second portion is the same as or similar to that seen from the first portion. Therefore, when the eyes of the user rotate and the eyes of the user turn from the front view to the oblique view of the first part, the user does not feel uncomfortable due to large brightness difference of the received ambient light. The user experience of the lens of the embodiment is better.
In one embodiment, the second portion includes a lens and a transmittance reducing film. It will be appreciated that the antireflection film serves to reduce the transmittance of ambient light, thereby reducing the transmittance of the second portion. The lens comprises a first light inlet surface and a second light outlet surface which are arranged in a back-to-back mode. The transmittance reducing film is positioned between the first light inlet surface and the second light outlet surface. And the ambient light sequentially passes through the first light inlet surface and the antireflection film and then is emitted out through the second light outlet surface.
In this embodiment, the transmittance of the second portion is reduced by disposing the transmittance reducing film between the first light inlet surface and the second light outlet surface, and the transmittance of the second portion is similar to that of the first portion. At this time, when the user wears the head-mounted display device, the first portion and the second portion of the lens do not have a problem of a large difference in brightness.
In one embodiment, the first side of the first portion is adjacent to the second side of the second portion; the shape of the semi-reflecting and semi-permeable membrane positioned on the first side surface is a first shape; the shape of the permeability-reducing membrane at the second side is a second shape; the first shape matches the second shape. It is understood that when the first shape is matched with the second shape, the transflective film and the permeability reducing film are connected with each other and are in face-to-face fit. At this time, the ambient light entering the second portion through the first light inlet surface or the ambient light entering the first portion through the compensator can only pass through the transflective film or the transflective film once, that is, the ambient light cannot simultaneously pass through the transflective film and the transflective film, so that the brightness of the whole lens area is ensured to be relatively consistent, that is, the light transmission uniformity of the whole lens is relatively good, and thus, a user is ensured not to feel uncomfortable due to large brightness difference of the received ambient light.
In one embodiment, the anti-reflection film is a plating layer formed between the first light inlet surface and the second light outlet surface by a magnetron sputtering or evaporation process. In this embodiment, the formation process of the permeation reduction film is simple and convenient to operate.
In one embodiment, the permeability reducing membrane comprises one or more of a semi-reflective and semi-permeable membrane, an absorbing membrane, or a polarizing membrane.
Because the cost of the transflective film, the absorption film or the polarizing film is low, the cost of the formed lens is also low, that is, the cost of the head-mounted display device is also low.
In one embodiment, the second part comprises a substrate and a color masterbatch mixed within the substrate.
In this embodiment, the second part is prepared in a simple manner and is easy to operate. In addition, the light transmittance of each area of the second part is uniform.
In one embodiment, the second portion is a ring structure, the second portion has a receiving space, and the first portion is disposed in the receiving space. By arranging the second part into an annular structure, on one hand, the first part and the second part are convenient to assemble, and on the other hand, the connecting area of the first part and the second part is larger, so that the first part and the second part are more firmly connected, namely, the first part is not easy to fall off from the second part.
Drawings
In order to explain the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be described below.
FIG. 1 is a schematic structural diagram of an embodiment of a head-mounted display device provided in an embodiment of the present application;
FIG. 2 is a schematic view of an optical path between a display module and a lens of the head-mounted display device shown in FIG. 1;
FIG. 3 is a schematic structural diagram of one embodiment of a lens of the head mounted display device shown in FIG. 1;
FIG. 4 is an exploded view of the lens of FIG. 3 at one angle;
FIG. 5 is a schematic view of the light path of the lens of FIG. 3 in cooperation with a display module;
FIG. 6 is an exploded view of the lens shown in FIG. 3 at another angle;
FIG. 7 is a schematic structural diagram of another embodiment of a lens of the head mounted display device shown in FIG. 1;
fig. 8(a) is a partially exploded schematic view of the lens shown in fig. 7. Wherein (a1) is a schematic diagram of an explosion at an angle; (a2) is a schematic diagram of an explosion at another angle;
fig. 8(b) is an exploded schematic view of the lens shown in fig. 7. (ii) a
FIG. 9 is a schematic cross-sectional view of the lens shown in FIG. 7 at line A-A;
FIG. 10 is a schematic structural diagram of another embodiment of a lens of the head mounted display device shown in FIG. 1;
FIG. 11 is a schematic cross-sectional view of the lens shown in FIG. 10 at B-B;
FIG. 12 is a schematic structural diagram of another embodiment of a lens of the head mounted display device shown in FIG. 1;
FIG. 13 is a schematic cross-sectional view of the lens of FIG. 12 at line C-C;
FIG. 14 is a schematic structural diagram of another embodiment of a lens of the head mounted display device shown in FIG. 1;
FIG. 15 is a schematic structural diagram of another embodiment of a lens of the head-mounted display device shown in FIG. 1, wherein (a) in FIG. 15 is a schematic view of the lens at an angle; FIG. 15 (b) is a schematic view of the lens at another angle;
FIG. 16 is a schematic partially exploded view of the lens shown in FIG. 15;
FIG. 17 is a light path diagram of the lens of FIG. 15 in cooperation with a display module;
fig. 18 is a schematic structural diagram of another implementation of a head-mounted display device provided in an embodiment of the present application.
Detailed Description
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a head-mounted display device according to the present application. The head-mounted display device 100 may be augmented reality (ar) glasses or an ar helmet. The head-mounted display device 100 of the embodiment shown in fig. 1 is illustrated by using ar glasses as an example.
As shown in fig. 1, the head-mounted display device 100 includes a frame 10, a display module 20, and a lens 30. Optionally, the frame 10 includes a frame 11 and temples 12. The frame 11 may include a nose pad for wearing over the nose of a user. Furthermore, the temples 12 are intended to be worn at the ears of the user. At this time, when the user wears the head-mounted display apparatus 100 on the head, the head-mounted display apparatus 100 may be fixed on the head of the user through the temples 13 and the nose pads.
Further, the number of the lenses 30 is two. Both lenses 30 are mounted to the frame 10. Specifically, the frame 11 is provided with two mounting holes. The shape of the mounting hole is adapted to the shape of the lens 30. The two lenses 30 are mounted in the two mounting holes in a one-to-one correspondence. At this time, the user can see the real world through the two lenses 30. Of course, in other embodiments, the number of lenses 30 is not limited. For example, the lens 30 may be one, but the lens 30 is sized to cover both eyes of the user. At this time, the frame 11 is provided with a mounting hole. The lens 30 is mounted directly within the mounting hole. The user's eyes can view the real world directly through the lens 30.
In addition, the number of the display modules 20 is two. The display module 20 can be mounted to the frame 10. Optionally, the display module 20 may be disposed inside the frame 11, so as to effectively protect the display module 20 through the frame 11, and prevent the display module 20 from being damaged by collision with external objects. Each display module 20 is disposed corresponding to one lens 30. The two display modules 20 respectively provide virtual images for the two mirrors 30. The virtual image may be, but is not limited to, a three-dimensional virtual image. Alternatively, the display module 20 may be, but is not limited to, a display screen or a projector. In addition, the display module 20 may be a micro display module. Such as a miniature display screen or a miniature projector. Of course, in other embodiments, the number of the display modules 20 may be one. The display module 20 provides a virtual image for the two lenses 30 through partitioning. In addition, the display module 20 can be connected to an external device for wireless communication. At this time, the display module 20 can receive a virtual image provided by an external device and provide the received virtual image to a user through the lens 30.
In the embodiment, the lens 30 can transmit the display light emitted by the display module 20 to the eyes of the user, so that the user can see the virtual image displayed by the display module 20 through the lens 30. The lens 30 is also capable of delivering ambient light to the user's eye to enable the user to view the real world by receiving the real world ambient light through the lens 30. Therefore, the head-mounted display device 100 of the present embodiment enables the user to see the image in which the real image and the virtual image are combined.
For example, the user can play a three-dimensional virtual reality game using the head mounted display device 100. At this time, when the user wears the head mounted display device 100, the lens 30 transfers the real world as a background image to the user's eyes, for example, the real world is a piece of forest. At this point, the user sees an image of a piece of forest. In addition, the display module 20 can provide a three-dimensional virtual image with virtual objects and virtual objects. For example, the virtual object is a weapon and the virtual object is a character. At this time, the lens 30 transmits the virtual object and the virtual object provided by the display module 20 to the eyes of the user. At this point, the user sees the image with a virtual weapon and virtual character in a forest.
The above describes that the user can see the image in which the real image and the virtual image are combined through the head-mounted display apparatus 100. The propagation paths of the light rays of the first portion 31 and the second portion 32 of the lens 30 will be described in detail with reference to fig. 2. Fig. 2 is a schematic optical path diagram of the display module 20 and the lens 30 of the head-mounted display device 100 shown in fig. 1.
As shown in fig. 2, lens 30 includes a first portion 31 and a second portion 32. The first portion 31 is disposed adjacent to the second portion 32. That is, the second portion 32 is located at the periphery of the first portion 31. The periphery of the first portion 31 refers to the area around the first portion 31. At this time, the first portion 31 can be effectively protected by the second portion 32, and the first portion 31 is prevented from being damaged. It is to be understood that fig. 2 illustrates that the second portion 32 includes a first body portion 326 and a second body portion 327. The first body portion 326 and the second body portion 327 are respectively located at two sides of the first portion 31. The first body portion 326, the first portion 31 and the second body portion 327 are spliced into a continuous lens 30. The structure of the second portion 32 is not limited to that shown in fig. 2. For example, the structure of the second portion 32 can also be the structure shown in fig. 12, 14 and 15, and the detailed description can be referred to below.
In the present embodiment, by providing the second part 32 as the divided first and second body portions 326 and 327, the divided first and second body portions 326 and 327 can be mounted to the first part 31 from both sides of the first part 31 when the second part 32 is mounted to the first part 31. At this time, the assembling manner of the lens 30 is simple and convenient to operate.
As shown in fig. 2, the display light emitted from the display module 20 enters the eyes of the user after passing through the first portion 31. Ambient light may also enter the user's eye after passing through the first portion 31. Further, ambient light may enter the user's eye after passing through/through the second portion 32, thereby enabling the user to see the real world through the second portion 32. Therefore, the user can see a larger real world area through the cooperation of the second portion 32 and the first portion 31, thereby increasing the comfort of the user viewing the outside. Of course, the real world as seen by the user through the first portion 31 and the real world as seen through the second portion 32 may partially overlap.
The specific structure of the first portion 31 of the lens 30 and the propagation path of light (including display light and ambient light) in the first portion 31 are described in detail below with reference to fig. 3 to 5. Fig. 3 is a schematic structural diagram of an embodiment of the lens 30 of the head-mounted display device 100 shown in fig. 1. Fig. 4 is an exploded view of the lens 30 shown in fig. 3 at one angle. Fig. 5 is a schematic ray path diagram of the first portion of the lens shown in fig. 3.
Referring to fig. 3 and 4, the first portion 31 includes a free-form surface prism 311, a transflective film 312, and a compensation mirror 313 stacked in sequence. The transflective film 312 is located between the free-form surface prism 311 and the compensation mirror 313. It will be appreciated that when light (including ambient light and display light) is transmitted through the transflective film 312, the transflective film 312 can reflect half of the light and transmit half of the light. The free-form surface prism 311, the transflective film 312 and the compensator 313 are located between the first body part 326 and the second body part 327.
As shown in fig. 4 and with reference to fig. 3, the free-form surface prism 311 includes a first light incident surface 3112, a second light incident surface 3111 (fig. 3 illustrates the second light incident surface 3111 under different angles), and a first light emitting surface 3113 (fig. 3 illustrates the first light emitting surface 3113 under different angles). It can be understood that the first light incident surface 3112 is disposed opposite to the first light emergent surface 3113. The second light incident surface 3111 is located between the first light incident surface 3112 and the first light emitting surface 3113. The first light incident surface 3112 is adjacent to the transflective film 312, that is, the transflective film 312 is located between the first light incident surface 3112 and the compensating mirror 313. It can be understood that when the user wears the head-mounted display device 100, the first light-emitting surface 3113 faces the user's eyes, that is, the user's eyes receive the light emitted through the first light-emitting surface 3113. It is understood that the transflective film 312 is used for reflecting the display light received by the second light incident surface 3111 to the first light emergent surface 3113. The transflective film 312 is further used for transmitting the ambient light incident through the compensation mirror 313 to the first light incident surface 3112.
As shown in fig. 4, the compensating mirror 313 has a third light incident surface 3131. The third light incident surface 3131 is a surface of the compensation mirror 313 facing away from the transflective film 312. The ambient light enters the compensation mirror 313 through the third light incident surface 3131. In addition, the first light incident surface 3112 is used for making the ambient light entering the compensation mirror 313 enter the free-form surface prism 311. The second light incident surface 3111 is configured to receive the display light emitted by the display module 20 (see fig. 2), that is, the display light emitted by the display module 20 (see fig. 2) enters the free-form surface prism 311. The first light emitting surface 3113 is used for allowing the display light and the ambient light entering the free-form surface prism 311 to pass through the free-form surface prism 311. Specifically, the light transmission path of the first portion 31 is described in detail below with reference to fig. 5.
Referring to fig. 5, when the display module 20 emits the display light. The display light enters the inside of the free-form surface prism 311 through the second light incident surface 3111. At this time, part of the display light propagates to the transflective film 312 under the total reflection of the first light-emitting surface 3113. The part of the display light is reflected by the transflective film 312, exits through the first light-emitting surface 3113, and is projected to the eyes of the user. At this time, the user can receive the virtual image transmitted by the display module 20. In addition, the ambient light enters the compensation mirror 313 through the third light incident surface 3131 of the compensation mirror 313. At this time, the ambient light sequentially transmits through the compensation mirror 313 and the transflective film 312 to the first light incident surface 3112, and enters the free-form surface prism 311 through the first light incident surface 3112. The ambient light entering the free-form surface prism 311 is emitted through the first light-emitting surface 3113 and is projected to the eyes of the user. At this time, the user can receive the ambient light, that is, the user can see the real world. Thus, the user can see the image in which the real image is combined with the virtual image through the first portion 31.
The specific structure of the first portion 31 and the propagation path of the light in the first portion 31 are described above in detail. Several embodiments of the positional relationship and the connection relationship of the structures of the first portion 31 will be given below by referring to fig. 4 and fig. 6. Fig. 6 is an exploded view of the lens 30 shown in fig. 3 at another angle.
As shown in fig. 4, the third light incident surface 3131 may be identical to the first light emitting surface 3113 (fig. 3 illustrates the first light emitting surface 3113 under different angles). It can be understood that, since the shapes of the first light incident surface 3112 and the first light emitting surface 3113 of the free-form surface prism 311 are different, when the ambient light enters the free-form surface prism 311 from the first light incident surface 3112 and exits from the first light emitting surface 3113, the ambient light is distorted. At this time, by disposing the compensation mirror 313 on the first light incident surface 3112, and the shape of the third light incident surface 3131 of the compensation mirror 313 can be consistent with the shape of the first light emitting surface 3113 of the free-form surface prism 311, the ambient light entering the compensation mirror 313 through the third light incident surface 3131 and the ambient light exiting the free-form surface prism 311 from the first light emitting surface 3113 will not be distorted. Of course, in consideration of the processing error, the shapes of the third light incident surface 3131 and the first light emitting surface 3113 may have a slight deviation, i.e., substantially coincide.
In one embodiment, the refractive index of the compensating mirror 313 is the same as the refractive index of the freeform prism 311. At this time, when the ambient light passes through the compensation mirror 313 and the free-form surface prism 311, because the refractive index of the compensation mirror 313 is the same as that of the free-form surface prism 311, the refraction change of the ambient light at the compensation mirror 313 and the free-form surface prism 311 is uniform, and at this time, when the ambient light is projected to the eyes of the user, the real world presented by the eyes of the user does not have object image shift, so that the comfort level of the user for watching the real world through the lens 30 is better.
In one embodiment, the transflective film 312 is stacked on the first light incident surface 3112. The compensation mirror 313 is fixed on the transflective film 312 through a transparent optical adhesive. It is understood that the transparent optical adhesive can fill the gap between the compensation mirror 313 and the transflective film 312, that is, the transparent optical adhesive can absorb the tolerance existing in the manufacturing or fixing process of the compensation mirror 313 and the transflective film 312, so as to make the integrity of the first portion 31 better, and further make the appearance of the first portion 31 better, that is, the user cannot see the gap inside the first portion 31. Of course, in other embodiments, the transflective film 312 is stacked on the compensation mirror 313. At this time, the free-form surface prism 311 is fixed to the transflective film 312 by a transparent optical adhesive.
In addition, the refractive index of the transparent optical cement is the same as that of the compensation mirror 313. When the ambient light passes through the compensation mirror 313 and the transparent optical cement, because the refractive index of the transparent optical cement is the same as that of the compensation mirror 313, the refraction change of the ambient light between the compensation mirror 313 and the transparent optical cement is uniform, and at this time, when the ambient light is projected to the eyes of the user, the real world presented by the eyes of the user does not have object image displacement, so that the comfort level of the user for watching the real world through the lens 30 is better.
In addition, since the refractive index of the transparent optical cement is the same as that of the compensating mirror 313, the transparent optical cement is formed integrally with the compensating mirror 313. At this time, no obvious connection surface or connection line appears at the connection between the transparent optical cement and the compensating mirror 313, thereby ensuring that the first portion 31 has a better appearance, that is, no obvious connection surface or connection line appears inside the first portion 31 when a user looks at the first portion 31.
As shown in fig. 6, the compensating mirror 313 includes a third light emitting surface 3132. The third light emitting surface 3132 is a surface of the compensation mirror 313 facing the free-form surface prism 311. The third light emitting surface 3132 is disposed opposite to the third light entering surface 3131 (see fig. 4). The third light emitting surface 3132 may be identical to the first light incident surface 3112 (fig. 4 illustrates the first light incident surface 3112 under different angles). It can be understood that, if the third light-emitting surface 3132 of the compensating mirror 313 is directly attached to the first light-incident surface 3112 of the free-form surface prism 311, a large gap may not be formed between the third light-emitting surface 3132 and the first light-incident surface 3112, that is, the third light-emitting surface 3132 and the first light-incident surface 3112 can be better surface-attached to each other. At this time, when the transflective film 312 is disposed between the free-form surface prism 311 and the compensation mirror 313, since a large gap does not occur between the third light emitting surface 3132 and the first light incident surface 3112, the transflective film 312 does not need to increase in thickness at the large gap to fill the gap. Therefore, the thickness of the transflective film 312 is uniform, and at this time, the brightness of the ambient light passing through the transflective film 312 is also uniform, that is, the brightness passing through the first portion 31 is also uniform. Of course, in consideration of the error of the processing process, the shapes of the third light emitting surface 3132 and the first light incident surface 3112 may have a slight deviation, i.e., substantially coincide.
In addition, since a large gap does not occur between the third light emitting surface 3132 and the first light incident surface 3112, the propagation direction of the ambient light does not change greatly at the gap, so that when the user watches the real world from the first portion 31, the image seen by the user does not change greatly or change abruptly, and the user has a better comfort level.
The propagation path of light rays in the first portion 31 is described in detail above, and it can be understood that when the first portion 31 is provided with the transflective film 312, the transflective film 312 reflects part of the ambient light, and at this time, the real world brightness seen by the user from the first portion 31 is dark. While the second portion 32 allows most of the ambient light to pass through, the user sees the real world brightness from the second portion 32 as brighter. At this time, when the eyes of the user turn from the position of the first portion 31 to the position of the second portion 32, the difference in brightness of the ambient light received by the user is large, thereby causing discomfort to the user. In the present embodiment, the light transmittance of the second portion 32 is closer to the light transmittance of the first portion 31 by setting the ratio of the light transmittance of the second portion 32 to the light transmittance of the first portion 31 within the threshold range, and the threshold range is between 0.5 and 1.5. At this time, when the eyes of the user turn from the position of the first portion 31 to the position of the second portion 32, the user does not feel uncomfortable because the difference in the brightness of the received ambient light is large. Therefore, the user experience of the head-mounted display device 100 of the embodiment is better. It is understood that the threshold range is a predetermined range.
In addition, the brightness difference of different areas of the lens 30 is small, so that the quality of the picture displayed by the head-mounted display device 100 is better.
Optionally, the threshold value ranges between 0.9 and 1.1. The light transmittance is almost uniform throughout the lens 30. At this time, the brightness of the entire area of the lens 30 seen by the user is almost uniform, so that the user does not feel uncomfortable due to a large difference in brightness of the received ambient light when the user's eyes turn from the position of the first section 31 to the position of the second section 32.
Two embodiments of reducing the light transmittance of the second portion 32 will be described in detail below with reference to fig. 7 to 11.
The first embodiment: the light transmittance of second portion 32 is reduced by providing a transmittance reducing film 322 within second portion 32. In this embodiment, the permeation reduction film 322 may be formed by two embodiments. The first embodiment: the antireflection film 322 is formed by forming a plating layer between the first light entering surface 3211 and the second light exiting surface 3212 by magnetron sputtering or evaporation. The second embodiment: the permeability reducing film 322 is one or more of a semi-reflective and semi-permeable film, an absorption film or a polarization film.
The second embodiment: the light transmittance of the second portion 32 is reduced by providing a color concentrate 324 inside the substrate 323 of the second portion 32.
First, referring to fig. 7 to 9, the first embodiment is described in detail, and the light transmittance of the second portion 32 is reduced by disposing the transmittance reducing film 322 in the second portion 32, so as to improve the quality of the display image of the head-mounted display device 100. Fig. 7 is a schematic structural diagram of another embodiment of the lens 30 of the head-mounted display device 100 shown in fig. 1. Fig. 8(a) is a partially exploded schematic view of the lens 30 shown in fig. 7. Wherein (a1) is a schematic diagram of an explosion at an angle; (a2) is a schematic illustration of the explosion at another angle. Fig. 8(b) is an exploded schematic view of the lens 30 shown in fig. 7. Fig. 9 is a schematic cross-sectional view of the lens 30 shown in fig. 7 at line a-a.
As shown in fig. 7, the second portion 32 includes a lens 321 and a permeability reducing film 322. The lens 321 may transmit most of the ambient light.
In the present embodiment, as shown in fig. 8(a) and 8(b), the first portion 31 is located between the first main body portion 326 and the second main body portion 327. In addition, the first body portion 326 is taken as an example, that is, the first body portion 326 includes the lens 321 and the permeability reducing film 322. The transmittance reducing film 322 serves to reduce the transmittance of ambient light, thereby serving to reduce the transmittance of the second portion 32. In addition, the second body portion 327 may also include a lens and a transmittance reducing film. The lens and the antireflection film of the second body portion 327 can be disposed with reference to the first body portion 326, which will not be described in detail below.
As shown in fig. 8(b), the lens 321 includes a first light entering surface 3211 and a second light exiting surface 3212 (fig. 7 illustrates the second light exiting surface 3212 at another angle) which are disposed opposite to each other. The first light incident surface 3211 is used to allow ambient light to enter the lens 321. The second light emitting surface 3212 is used for allowing ambient light entering the lens 321 to pass out. It can be understood that when the user wears the head-mounted display device 100, the second light emitting surface 3212 faces the user's eye. At this time, when the ambient light enters the lens 321 through the first light entering surface 3211, the ambient light passes through the transmittance reducing film 322 and exits the lens 321 through the second light exiting surface 3212. Ambient light passing out of lens 321 is projected to the user's eye.
In the embodiment, the transmittance of the first main body 326 is reduced by disposing the transmittance reducing film 322 between the first light incident surface 3211 and the second light emitting surface 3212, so that the transmittance of the first main body 326 is close to that of the first portion 31. At this time, when the user wears the head-mounted display device 100, the first portion 31 and the second portion 32 of the lens 30 do not have a problem of a large difference in brightness, that is, the brightness of the real world seen by the user from the second portion 32 is substantially the same as the brightness of the real world seen from the first portion 31. Therefore, when the eyes of the user turn from the front-view first portion 31 to the oblique-view second portion 32, the user does not feel uncomfortable due to a large brightness difference of the received ambient light, so that the user experience of the head-mounted display device 100 of the embodiment is better.
Optionally, the refractive index of the lens 321 is the same as the refractive index of the compensation mirror 313. For example, the lens 321 is made of the same material as that of the compensating mirror 313. At this time, when the ambient light passes through the first portion 31 and the second portion 32, because the refractive index of the lens 321 is the same as that of the compensating mirror 313, the refractive change of the ambient light in the first portion 31 and the second portion 32 is uniform, and at this time, when the ambient light is projected to the eyes of the user, the real world presented by the eyes of the user does not have the object image shift, so that the comfort of the user viewing the real world through the lens 30 is better.
Referring to fig. 8(b), the lens 321 includes a first light-transmitting portion 3213 and a second light-transmitting portion 3214 opposite to each other. In the present embodiment, the first body portion 326 is taken as an example for description. In this case, the first body 326 includes a first light-transmitting portion 3213 and a second light-transmitting portion 3214 which are disposed to face each other. The light-transmitting film 322 is provided between the first light-transmitting portion 3213 and the second light-transmitting portion 3214. In addition, the second body portion 327 can refer to the structure of the first body portion 326, and the description thereof is omitted.
In addition, a surface of the first light transmitting portion 3213 facing away from the second light transmitting portion 3214 is a first light incident surface 3211. The surface of the second light-transmitting portion 3214 facing away from the first light-transmitting portion 3213 is a second light-emitting surface 3212.
In this embodiment, the lens 321 is provided with the first light transmission portion 3213 and the second light transmission portion 3214, so that in the process of providing the light-transmitting film 322 on the lens 321, the light-transmitting film 322 may be provided on one of the first light transmission portion 3213 and the second light transmission portion 3214, and then the other may be fixed to the light-transmitting film 322. The mounting process of the permeability reducing film 322 of this embodiment is simple and easy to operate.
In other embodiments, the lens 321 may be a unitary structure. At this time, the permeation reducing film 322 is disposed inside the lens 321. For example, the lens 321 is formed by an injection molding process. Specifically, a part of the lens 321 is formed, and after cooling molding, the permeation reduction film 322 is fixed to the part. Finally, another portion of the lens 321 is formed by an injection molding process. After another portion of the lens 321 is cooled and molded, the second portion 32 is formed. In this case, the permeability reducing film 322 is formed integrally with the lens 321, i.e., the second portion 32 is preferably formed integrally.
In one embodiment, referring to FIG. 8(a), the first side 319 of the first portion 31 is adjacent to the second side 329 of the second portion 32. The transflective film 312 is positioned on the first side 319 and has a first shape. The shape of the reduced-permeability membrane 322 at the second side 329 is a second shape. The first shape matches the second shape. It will be appreciated that when the first shape is matched to the second shape, the transflective film 312 and the permeability reducing film 322 are coupled to each other and conform to each other. At this time, the ambient light entering the second portion 32 through the first light entering surface 3211 or the ambient light entering the first portion 31 through the third light entering surface 3131 can only pass through the transflective film 322 or the transflective film 312 once, that is, the ambient light cannot pass through both the transflective film 322 and the transflective film 312, so as to ensure that the brightness of the entire lens 30 area is relatively consistent (it can be understood that when the ambient light passes through one of the transflective film 322 or the transflective film 312 more than once, the brightness at the position will also be reduced more than once, and at this time, the brightness of the first portion 31 or the second portion 32 is not uniform). Therefore, the light transmission uniformity of the whole lens 30 of the embodiment is better, and further, it is ensured that the user does not feel uncomfortable due to the large brightness difference of the received ambient light.
In one embodiment, referring to fig. 9, the edge of the permeability reducing membrane 322 is attached to the edge of the transflective membrane 312. At this time, the first light transmission portion 3213 is connected to the compensation mirror 313, and the second light transmission portion 3214 is connected to the free-form surface prism 311.
It will be appreciated that the permeability reducing membrane 322 is joined to the semipermeable membrane 312 to form a continuous membrane layer. At this time, the ambient light entering the second portion 32 through the first light incident surface 3211 or the ambient light entering the first portion 31 through the third light incident surface 3131 can only pass through the transflective film 322 or the transflective film 312 once, that is, the ambient light cannot simultaneously pass through the transflective film 322 and the transflective film 312, so as to ensure that the brightness of the entire lens 30 area is relatively uniform. Therefore, the light transmission uniformity of the whole lens 30 of the embodiment is better, and further, it is ensured that the user does not feel uncomfortable due to the large brightness difference of the received ambient light.
Optionally, the permeability reducing membrane 322 is smoothly connected to the transflective membrane 312. At this time, no abrupt protrusion or depression occurs at the joint of the reduction film 322 and the transflective film 312, so that the propagation direction of the ambient light passing through the joint of the reduction film 322 and the transflective film 312 and the propagation direction of the ambient light passing through the reduction film 322 or the transflective film 312 do not change abruptly, so that when the eyes of the user rotate from the position of the first portion 31 to the position of the second portion 32, the real world seen by the user does not change greatly or abruptly, and at this time, the viewing comfort of the user is better.
Optionally, the first light incident surface 3211 is smoothly connected to the third light incident surface 3131 of the compensation mirror 313. At this time, a relatively abrupt protrusion or depression does not occur at the connection between the first light incident surface 3211 and the third light incident surface 3131 of the compensation mirror 313, so that the first light incident surface 3211 and the third light incident surface 3131 of the lens 30 are relatively smooth, i.e., the appearance of the lens 30 is more beautiful. In addition, since no more abrupt protrusion or depression is formed at the connection between the first light incident surface 3211 and the third light incident surface 3131, the propagation direction of the ambient light entering the lens 30 through the connection between the first light incident surface 3211 and the third light incident surface 3131 and the propagation direction of the ambient light passing through the first light incident surface 3211 and the third light incident surface 3131 do not change more abruptly, so that when the eyes of the user rotate from the position of the first portion 31 to the position of the second portion 32, the real world seen by the user does not change greatly or abruptly, and at this time, the viewing comfort of the user is better.
The structure of two embodiments of the permeability reducing membrane 322 will be described in detail below.
In the first embodiment, the transmittance reducing film 322 is a plating layer formed between the first light entering surface 3211 and the second light exiting surface 3212 by a magnetron sputtering or evaporation process.
Specifically, a plating layer is formed on the surface of the first light transmission portion 3213 facing the second light transmission portion 3214 by magnetron sputtering or vapor deposition. The second light-transmitting portion 3214 is then bonded to the plating layer by a transparent optical adhesive. At this time, the plating layer formed between the first light transmission portion 3213 and the second light transmission portion 3214 is the light-transmitting film 322. The plating formed reduces the ambient light passing out of the lens 321, i.e., reduces the light transmittance of the second portion 32. In another embodiment, a plating layer may be formed on the surface of the second light transmission portion 3214 facing the first light transmission portion 3213 by magnetron sputtering or vapor deposition.
Optionally, the plating layer includes a first sub-plating layer and a second sub-plating layer stacked on the first sub-plating layer. The material of the first sub-plating layer comprises one of silicon dioxide or magnesium fluoride. The material of the second sub-plating layer comprises one of titanium oxide, neodymium oxide or zirconium oxide. Since the sub-plating layers of different materials have different light transmittances, forming the reduced-transmittance film 322 by laminating a plurality of sub-plating layers can accurately control the light transmittance of the reduced-transmittance film 322.
Optionally, the thickness of the first sub-plating layer ranges from 70 nm to 100 nm. The thickness of the second sub-plating layer ranges from 2.5 to 60 nm. In this case, the thickness of the plating layer is small, which is advantageous for the thin-type installation of the lens 30.
Optionally, the plating is planar. At this time, the thickness uniformity of the plating layer is better, and the processing difficulty of the plating layer is lower. In other embodiments, the plating layer may be curved. At this time, when the plating layer is connected to the transflective film 312, the plating layer and the transflective film 312 can be spliced into a continuous curved surface.
In a second embodiment, the permeability reducing membrane 322 comprises one or more of a transflective membrane, an absorptive membrane, or a polarizing membrane.
In this embodiment, one or more of a transflective film, an absorption film, or a polarizing film is directly fixed between the first light-transmitting portion 3213 and the second light-transmitting portion 3214. Because the cost of the transflective, absorptive, or polarizing film is low, the cost of the formed lens 30 is also low, i.e., the cost of the head-mounted display device 100 is also low.
Optionally, one or more of a transflective film, an absorption film, or a polarizing film is fixed between the first light-transmitting portion 3213 and the second light-transmitting portion 3214 by a transparent optical adhesive.
In addition, when the permeability reducing film 322 is a transflective film, the permeability reducing film 322 of the second portion 32 and the transflective film 312 of the first portion 31 are made of the same material. At this time, the illumination intensity of the ambient light passing through the transmittance-reducing film 322 is closer to the illumination intensity of the ambient light passing through the transflective film 312, and at this time, the light transmittance of the first portion 31 is closer to the light transmittance of the second portion 32 to a greater extent. Further, the thickness of the permeability reducing membrane 322 is the same as the thickness of the transflective membrane 312 of the first portion 31. At this time, the illumination intensity of the ambient light passing through the transflective film 322 is the same as the illumination intensity of the ambient light passing through the transflective film 312.
In addition, the absorption film refers to a film sheet that can absorb a part of ambient light. When the reduction film 322 is an absorbing film, the absorbing film can absorb a portion of the ambient light entering the lens 321, thereby reducing the illumination intensity of the second portion 32. The present embodiment can select the light absorption film with specific absorption rate according to the light transmittance of the first portion 31. For example, the first portion 31 has a light transmittance of 50%. At this time, the permeation reducing film 322 is an absorption film having an absorption rate of 50%.
Further, the polarizing film refers to a film sheet capable of passing partially polarized light therethrough. When the antireflection film 322 is a polarizing film, the polarizing film can allow a portion of the ambient light entering the lens 321 to pass through, thereby reducing the intensity of the second portion 32. The polarizing film of the present embodiment may also select a corresponding polarizing film according to the magnitude of the light transmittance of the first part 31.
Optionally, the permeability reducing film 322 is a single layer film. For example, the permeability reducing film 322 is one of a semi-reflective and semi-permeable film, an absorption film, or a polarizing film.
In some cases, the permeability reducing film 322 may also be a multilayer film. For example: the permeability reducing film 322 is a semi-reflective and semi-permeable film and an absorbing film arranged in a stack or an absorbing film or a polarizing film arranged in a stack. Since different types of film layers have different light transmittances, by providing the transmittance reducing film 322 as a multilayer film, the light transmittance of the second portion 32 can be controlled more flexibly, and the light transmittance of the second portion 32 and the light transmittance of the first portion 31 can be more easily approximated.
The first embodiment is specifically described above: the light transmittance of second portion 32 is reduced by providing a transmittance reducing film 322 within second portion 32. The second embodiment will be described in detail with reference to fig. 10 and 11: the light transmittance of the second portion 32 is reduced by providing a color concentrate 324 inside the substrate 323 of the second portion 32. The technical contents of the second embodiment that are the same as those of the first embodiment are not described again. Fig. 10 is a schematic structural diagram of still another embodiment of the lens 30 of the head-mounted display device 100 shown in fig. 1. Fig. 11 is a schematic cross-sectional view of the lens 30 shown in fig. 10 at B-B.
Referring to fig. 10 and 11, the second portion 32 includes a substrate 323 and a color master 324 mixed inside the substrate 323. In the embodiment, the first main body 326 includes a base material 323 and a color master batch 324 mixed in the base material 323. The structural arrangement of the second body portion 327 can be referred to the arrangement of the first body portion 326. It is understood that the color concentrate 324 is a plastic colorant with a pigment and a thermoplastic resin well dispersed therein. For example: the pigment can be, but is not limited to, titanium dioxide, carbon black or iron oxide red. In other embodiments, a base toner or other pigment toner may be mixed in the substrate 323.
In the present embodiment, by providing the color master 324 in the base 323 of the second portion 32, the light transmittance of the second portion 32 is reduced by the color master 324. At this time, when the eyes of the user rotate and turn from the front view first portion 31 to the front view second portion 32, the user does not feel uncomfortable due to a large brightness difference of the received ambient light, so that the user experience of the head-mounted display device 100 of the embodiment is better.
In addition, the second part 32 is simple to prepare and easy to operate. In addition, the light transmittance of the respective regions of the second portion 32 is relatively uniform.
Optionally, second portion 32 is formed by a dyeing process. Specifically, the color master 324 is uniformly mixed in a resin such as Polyamide (PA) or Polycarbonate (PC). The second part 32 is formed by injection molding the uniformly mixed resin. For example, the molded lens 30 is obtained by injecting a resin melted by heating and added with the color master 324 into a mold, and cooling.
In addition, the ratio of the color master 324 in the resin can be adjusted according to the transmittance of the first portion 31, so as to make the transmittance of the second portion 32 equal to the transmittance of the first portion 31 as much as possible.
Optionally, the material of the substrate 323 is the same as that of the compensation mirror 313. At this time, the refractive index of the base 323 is the same as that of the compensation mirror 313. Therefore, the real world seen by the user from the first part 31 and the real world seen by the user from the second part 32 can be spliced into a whole real world, and the viewing comfort of the user is better. In other words, when the refractive indexes of the substrate 323 and the compensating mirror 313 are different, the real world viewed by the user through the first portion 31 and the real world viewed from the second portion 32 cannot be spliced into a whole real world due to different imaging angles or different imaging multiples. At this time, when the eyes of the user rotate from the position of the first portion 31 to the position of the second portion 32, the image seen by the user may change greatly or abruptly, and the user may have poor viewing comfort.
Various embodiments of the second portion 32 in the first configuration are described above in detail. The second structure of the second portion 32 is described in detail below with reference to fig. 12, 13, and 14. Most of the same technical contents of the embodiments of the second part 32 in the second structure and the embodiments of the second part 32 in the first structure are not repeated. Fig. 12 is a schematic structural diagram of still another embodiment of the lens 30 of the head-mounted display device 100 shown in fig. 1. Fig. 13 is a schematic cross-sectional view of the lens 30 shown in fig. 12 at line C-C. Fig. 14 is a schematic structural diagram of still another embodiment of the lens 30 of the head-mounted display device 100 shown in fig. 1.
Referring to fig. 12 and 13, the second portion 32 further includes a third main body portion 328. The third body portion 328 is connected between the first body portion 326 and the second body portion 327, and the third body portion 328 is disposed adjacent to the first light emitting surface 3113 of the first portion 31. It is understood that the first light-emitting surface 3113 of the first portion 31 refers to a surface on which the display light and the ambient light exit the first portion 31.
Referring to fig. 13, one end of the third body portion 328 is connected to the surface of the first body portion 326 facing the first portion 31, and the other end is connected to the surface of the second body portion 327 facing the first portion 31. The connection relationship between the third body portion 328 and the first and second body portions 326 and 327 is not limited to that shown in fig. 13, and the connection relationship between the third body portion 328 and the first and second body portions 326 and 327 may be as shown in fig. 14. Reference is made to the description below.
In the present embodiment, when the first main body portion 326 and the second main body portion 327 are fixed on two sides of the first portion 31, and the third main body portion 328 is located on the light emitting side of the first portion 31, the first main body portion 326, the second main body portion 327 and the third main body portion 328 surround the periphery of the first portion 31. At this time, the first body portion 326, the second body portion 327 and the third body portion 328 can effectively protect the first portion 31, so as to prevent the first portion 31 from being damaged due to contact with other devices.
In addition, when the first main body portion 326, the second main body portion 327 and the third main body portion 328 surround the first portion 31, the integrity of the first main body portion 326, the second main body portion 327, the third main body portion 328 and the first portion 31 is better, and in this case, the structural strength of the lens 30 is stronger.
Optionally, the third main body portion 327 is fixedly connected to the first main body portion 326 and the second main body portion 327 through a transparent optical adhesive. In addition, the third body portion 327 is fixedly connected to the first portion 31 by a transparent optical adhesive.
Optionally, the material of the third body portion 327 is the same as the material of the first body portion 326 and the second body portion 327.
As shown in fig. 13, when the first portion 31 includes the free-form surface prism 311, the semi-reflective and semi-transparent film 312, and the compensation mirror 313 stacked in sequence, the third body portion 328 is fixedly connected to the first light-emitting surface 3113 of the free-form surface prism 311 (see the first light-emitting surface 3113 in fig. 3). At this time, the first body portion 326, the second body portion 327 and the third body portion 328 are located around the free-form surface prism 311, the transflective film 312 and the compensator 313 which are stacked.
Optionally, the third body portion 328, the first body portion 326 and the second body portion 327 are integrally formed. At this point, the integrity of the second portion 32 is stronger. In addition, compared with the method of separately preparing the first main body part 326, the second main body part 327, and the third main body part 328, and then splicing the first main body part 326, the second main body part 327, and the third main body part 328 into the second part 32, the third main body part 328, the first main body part 326, and the second main body part 327 of this embodiment are integrally formed, so that the preparation process of the second part 32 is simplified, and the cost investment of the second part 32 is saved.
It is understood that the structural arrangement of the first main body portion 326 and the second main body portion 327 of the present embodiment can refer to the structural arrangement of the first main body portion 326 and the second main body portion 327 of the above embodiments (for example, the light transmittance of the second portion 32 is reduced by disposing the transmittance reducing film 322 in the first main body portion 326. alternatively, the light transmittance of the second portion 32 is reduced by disposing the color master 324 in the interior of the substrate 323 of the first main body portion 326). Details are not described herein.
As shown in fig. 14, most of the same technical contents as those of the above embodiments are not repeated: one end of the third body 328 is connected to the second light emitting surface 3212 of the first body 326, and the other end is connected to the second light emitting surface 3212 of the second body 327.
Alternatively, in the process of assembling and forming the lens 30, the free-form surface prism 311, the semi-reflective and semi-transparent film 312 and the compensation mirror 313 of the first portion 31 may be stacked on the third body portion 328 in sequence. The first body portion 326 and the second body portion 327 are spliced around the first portion 31 and are fixedly connected to the surface of the third body portion 328 facing the first portion 31.
The second portion 32 is described above in a second configuration. The third structure of the second portion 32 will be described in detail below with reference to fig. 15 to 17. Fig. 15 is a schematic structural diagram of still another embodiment of the lens 30 of the head-mounted display device 100 shown in fig. 1, wherein (a) in fig. 15 is a schematic view of the lens 30 at an angle; fig. 15 (b) is a schematic view of the lens 30 at another angle. Fig. 16 is a partially exploded view of the lens shown in fig. 15. Fig. 17 is a light propagation path diagram of the lens 30 and the display module 20 shown in fig. 15.
Referring to fig. 15 and 16, the second portion 32 has a ring structure. The second portion 32 has a receiving space 325. The first portion 31 is provided in the accommodation space 325. It is to be understood that fig. 16 illustrates that the accommodating space 325 is formed by splicing a first space 3251, a second space 3252 and a third space 3253, respectively. However, the receiving space 325 may be an integral space.
In addition, the second portion 32 includes a first light entering surface 3211 and a second light exiting surface 3212 disposed opposite to each other. The accommodating space 325 extends from the first light incident surface 3211 to the second light emitting surface 3212. When the first portion 31 is disposed in the accommodating space 325, the first portion 31 is fixedly connected to a sidewall of the accommodating space 325, that is, the second portion 32 surrounds a peripheral side of the first portion 31.
In the present embodiment, when the first portion 31 is provided in the accommodating space 325, the second portion 32 surrounds the circumferential side surface of the first portion 31. At this time, the second portion 32 can effectively protect the first portion 31 to prevent the first portion 31 from being damaged by touching with other devices.
In addition, when the second portion 32 surrounds the peripheral side of the first portion 31, the second portion 32 has better integrity with the first portion 31, and the lens 30 also has stronger structural strength.
It can be understood that, by arranging the second portion 32 in a ring-shaped structure, on one hand, the assembly of the first portion 31 and the second portion 32 is facilitated, and on the other hand, the connection area between the first portion 31 and the second portion 32 is larger, so that the connection between the first portion 31 and the second portion 32 is more secure, that is, the first portion 31 is not easy to fall off the second portion 32.
In addition, in some cases, for the first portion 31 with a smaller optical index (e.g. the first portion 31 with a smaller area of the exit pupil area (also called eyebox) or the first portion with a smaller field of view (fov)), the first portion 31 is assembled on the second portion 32 of the ring structure, so that the area of the first portion 31 in all directions can be significantly increased, and thus the area of the lens 30 can be significantly increased. At this time, the user has a wider viewing field and better viewing comfort.
Further, in some cases, it is also possible to significantly increase the area of the free-form surface prism 311 in each direction and thus significantly increase the area of the lens 30 by providing the second portion 32 in the above-described configuration for the optical index determined by the free-form surface prism 311, that is, by fitting the free-form surface prism 311 to the second portion 32 of the ring-shaped configuration for determining the volume size of the free-form surface prism 311. At this time, the user has a wider viewing field and better viewing comfort.
In this embodiment, the ambient light enters the second portion 32 through the first light entering surface 3211 and exits the second portion 32 through the second light exiting surface 3212, i.e., the user can see the real world through the second portion 32.
Further, as shown in fig. 15, the second portion 32 includes a second light entrance surface 3219. The second light incident surface 3219 is connected between the first light incident surface 3211 and the second light emitting surface 312. The second light incident surface 3219 is configured to allow display light emitted by the display module 20 (see fig. 17) to enter the second portion 32 and enter the first portion 31 through the second portion 32.
As shown in fig. 17, when the display module 20 emits the display light. The display light enters the second portion 32 through the second light entrance surface 3219. The display light entering the second portion 32 exits the second portion 32 and enters the inside of the free-form surface prism 311 through the second light incident surface 3111 of the free-form surface prism 311. At this time, part of the display light propagates to the transflective film 312 under the total reflection of the first light-emitting surface 3113. The part of the display light is reflected by the transflective film 312, exits through the first light-emitting surface 3113, and is projected to the eyes of the user. At this time, the user can receive the virtual image transmitted by the display module 20. In addition, the ambient light enters the compensation mirror 313 through the third light incident surface 3131 of the compensation mirror 313. At this time, the ambient light sequentially passes through the compensation mirror 313 and the transflective film 312 to be transmitted to the first light incident surface 3112, and enters the free-form surface prism 311 through the first light incident surface 3112. The ambient light entering the free-form surface prism 311 is emitted through the first light-emitting surface 3113 and is projected to the eyes of the user. At this time, the user can receive the ambient light, that is, the user can see the real world. Thus, the user can see the image in which the real image is combined with the virtual image through the first portion 31.
As shown in fig. 16, the first portion 31 includes a free-form surface prism 311, a semi-reflective and semi-transparent film 312, and a compensation mirror 313, which are sequentially stacked. At this time, the free-form surface prism 311, the half-reflective half-transmissive film 312, and the compensator 313 are accommodated in the accommodating space 325. It is understood that the free-form surface prism 311, the transflective film 312 and the compensation mirror 313 are arranged in the same manner as the free-form surface prism 311, the transflective film 312 and the compensation mirror 313 of the embodiment in which the second part 32 of the first structure is arranged. And will not be described in detail herein.
As shown in fig. 16, the second portion 32 includes a lens 321 and a permeability reducing film 322. It is understood that the lens 321 and the permeability reducing membrane 322 are both annular in shape. In addition, the arrangement of the lens 321 and the permeability reducing film 322 can refer to the arrangement of the lens 321 and the permeability reducing film 322 of the second portion 32 of the first structure. For example, the lens 321 includes a first light-transmitting portion 3213 and a second light-transmitting portion 3214 which are provided to face each other. The light-transmitting film 322 is provided between the first light-transmitting portion 3213 and the second light-transmitting portion 3214. Unlike the above embodiments, the first light transmission portion 3213, the second light transmission portion 3214, and the light shielding film 322 are all annular structures. At this time, the first light transmission portion 3213 is provided with a first space 3251. The permeation reduction film 322 is provided with a second space 3252. The second light transmitting portion 3214 is provided with a third space 3253. The first space 3251, the second space 3252 and the third space 3253 are joined to form an accommodating space 325. In addition, the second portion 32 may also refer to the first configuration in which a color master 324 is disposed inside the base 323 of the second portion 32 to reduce the light transmittance of the second portion 32.
The above specifically describes a structure of the head-mounted display device 100, and the head-mounted display device 100 with another structure will be described with reference to fig. 18. The same technical contents as those of the head-mounted display device 100 of the first structure are not described in detail. Fig. 18 is a schematic structural diagram of another implementation manner of the head-mounted display device 100 according to the embodiment of the present application.
Specifically, the head-mounted display device 100 may further include an iris camera 40. The iris camera 40 is mounted to the frame 10. Optionally, an iris camera 40 is mounted to the frame 11. For example, iris camera 40 may be, but is not limited to being, an infrared camera. The iris camera 40 may acquire the change information of the iris position of the user and convert the change information of the iris into the coordinate information of the display module 20. The number of iris cameras 40 may be one for detecting information on changes in the iris position of one eye of the user. Of course, there may be two iris cameras 40 for detecting the change information of the iris positions of both eyes at the same time. At this time, the iris-position data collected by the two iris cameras 40 may complement or modify each other. It is understood that the iris camera 40 collects the change information of the iris position of the user, so that the user can see different virtual images in different areas. For example, when the user is looking up at the lens 30 at a first time, the user may see a weapon and a character in the first area. When the eyes of the user rotate, the iris camera 40 collects the change information of the iris position of the eyes and converts the change information into the change information of the coordinates of the display module 20. At this point, when the user looks to the left at lens 30 at a second time, the user may see another weapon or another character in the second area.
Referring to fig. 18 again, the head-mounted display device 100 may further include a structured light module 50. The structured light module 50 is mounted within the frame 10. The structured light module 50 can be used to scan the face of the user and obtain the feature information of the face of the user. At this time, the acquired facial feature information is compared with the preset facial information. When the comparison result matches, the head-mounted display device 100 is turned on. When the comparison result does not match, the head-mounted display device 100 is not started. In addition, the structured light module 50 can be used to interact with the display module 20 to implement virtual shopping. For example, when a user needs to purchase a new weapon, the display module 20 provides the user with a shopping list of virtual objects. At this time, the face information obtained by the structured light module 50 can be used to confirm whether the user purchases a weapon.
In other embodiments, the head-mounted display device 100 may further include an earphone, a microphone, and a wireless charging device. The earpiece and microphone are mounted within the frame 10. At this time, the user can receive voice information of other users through the receiver. For example, the information of the teammates' battles is received. The input of voice information may be entered through a microphone. At this time, the user can manipulate the virtual interface of the display module 20 through the voice message. In addition, the head-mounted display device 100 is wirelessly charged by the wireless charging device.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (11)
1. A head-mounted display device is characterized by comprising a frame, lenses and a display module, wherein the lenses and the display module are arranged on the frame;
the lens comprises a first portion and a second portion, the ratio of the light transmittance of the second portion to the light transmittance of the first portion being within a threshold range, the threshold range being between 0.5 and 1.5;
the first part is used for transmitting ambient light and also used for transmitting display light emitted by the display module;
the first part comprises a free-form surface prism, a semi-reflecting and semi-transmitting film and a compensating mirror which are sequentially stacked, wherein the semi-reflecting and semi-transmitting film is arranged between the free-form surface prism and the compensating mirror;
the free-form surface prism comprises a first light incident surface, a first light emergent surface and a second light incident surface, the first light incident surface is adjacent to the semi-reflective and semi-transparent film, the compensating mirror comprises a third light incident surface back to the semi-reflective and semi-transparent film, and the third light incident surface and the first light emergent surface are in the same shape;
the compensating mirror is used for receiving ambient light, the ambient light penetrates through the semi-reflecting and semi-transparent film, enters from the first light incident surface of the free-form surface prism and penetrates through the first light emergent surface;
the second light incident surface of the free-form surface prism is used for receiving the display light rays emitted by the display module, and the semi-reflecting and semi-transparent film is used for reflecting the display light rays received by the second light incident surface to the first light emergent surface;
the second part is used for transmitting the ambient light;
the second part comprises a lens and a permeability reducing film, the lens comprises a first light inlet surface and a second light outlet surface which are arranged in a back-to-back mode, the permeability reducing film is located between the first light inlet surface and the second light outlet surface, and ambient light sequentially passes through the first light inlet surface and the permeability reducing film and then is emitted out through the second light outlet surface; or the second part comprises a base material and color master batches mixed in the base material.
2. The head-mounted display device of claim 1, wherein when the second portion comprises a lens and a transmittance-reducing film,
the first side of the first portion and the second side of the second portion are adjacent;
the shape of the semi-reflecting and semi-permeable membrane positioned on the first side surface is a first shape;
the shape of the permeation reduction film at the second side surface is a second shape;
the first shape matches the second shape.
3. The head-mounted display device of claim 2, wherein the lens comprises a first light-transmitting portion and a second light-transmitting portion, which are disposed opposite to each other, a surface of the first light-transmitting portion facing away from the second light-transmitting portion is a first light-entering surface, a surface of the second light-transmitting portion facing away from the first light-transmitting portion is a second light-exiting surface, and the anti-reflection film is fixed between the first light-transmitting portion and the second light-transmitting portion.
4. The head-mounted display device according to claim 3, wherein the transmission reduction film is a plating layer formed by a magnetron sputtering or evaporation process on a surface of the first light transmission portion facing the second light transmission portion or a surface of the second light transmission portion facing the first light transmission portion.
5. The head-mounted display device of any of claims 1-3, wherein when the second portion comprises a lens and a transflective film, the transflective film comprises one or more of a transflective film, an absorbing film, or a polarizing film.
6. The head-mounted display device according to any one of claims 1 to 4, wherein the second portion includes a first main body portion and a second main body portion, and the first main body portion and the second main body portion are respectively located on both sides of the first portion.
7. The head-mounted display device of claim 6, wherein the second portion further comprises a third main body portion disposed between the first main body portion and the second main body portion, and the third main body portion is disposed adjacent to the first light exit surface of the first portion.
8. The head-mounted display device according to any one of claims 1 to 4, wherein the second portion is a ring-shaped structure, the second portion has an accommodation space, and the first portion is provided in the accommodation space.
9. A lens for a head-mounted display device, wherein the lens comprises a first portion and a second portion, wherein the first portion is disposed adjacent to the second portion, wherein a ratio of a light transmittance of the second portion to a light transmittance of the first portion is within a threshold range, and wherein the threshold range is between 0.5 and 1.5;
the first part comprises a free-form surface prism, a semi-reflecting and semi-transmitting film and a compensating mirror which are sequentially stacked;
the semi-reflecting and semi-transparent film is arranged between the free-form surface prism and the compensating mirror;
the free-form surface prism comprises a first light incident surface, a first light emergent surface and a second light incident surface, the first light incident surface is adjacent to the semi-reflective and semi-transparent film, the compensating mirror comprises a third light incident surface back to the semi-reflective and semi-transparent film, and the third light incident surface and the first light emergent surface are in the same shape;
the compensating mirror is used for receiving ambient light, the ambient light penetrates through the semi-reflecting and semi-transparent film, enters from the first light incident surface of the free-form surface prism and penetrates through the first light emergent surface;
the second light incident surface of the free-form surface prism is used for receiving display light rays emitted by the display module, and the semi-reflecting and semi-transparent film is used for reflecting the display light rays received by the second light incident surface to the first light emergent surface;
the second part is used for transmitting the ambient light; the second part comprises a lens and a permeability reducing film, the lens comprises a first light inlet surface and a second light outlet surface which are arranged in a back-to-back mode, the permeability reducing film is located between the first light inlet surface and the second light outlet surface, and ambient light sequentially passes through the first light inlet surface and the permeability reducing film and then is emitted out through the second light outlet surface; or the second part comprises a base material and color master batches mixed in the base material.
10. The optic of claim 9, wherein when the second portion comprises a lens and a antireflection film, the first side of the first portion and the second side of the second portion are adjacent;
the shape of the semi-reflecting and semi-permeable membrane positioned on the first side surface is a first shape;
the shape of the permeation reduction film at the second side surface is a second shape;
the first shape matches the second shape.
11. The lens according to claim 9 or 10, characterized in that the second portion is a ring-shaped structure, the second portion has a receiving space, and the first portion is disposed in the receiving space.
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| EP20848240.6A EP3985427A4 (en) | 2019-07-31 | 2020-07-17 | Lens and head-mounted display device |
| PCT/CN2020/102526 WO2021017885A1 (en) | 2019-07-31 | 2020-07-17 | Lens and head-mounted display device |
| US17/629,705 US20220283437A1 (en) | 2019-07-31 | 2020-07-17 | Lens and head-mounted display apparatus |
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| CN201910703281.XA CN110426853B (en) | 2019-07-31 | 2019-07-31 | Lens and head-mounted display device |
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| CN110426853A CN110426853A (en) | 2019-11-08 |
| CN110426853B true CN110426853B (en) | 2020-10-16 |
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| CN110426853B (en) * | 2019-07-31 | 2020-10-16 | 华为技术有限公司 | Lens and head-mounted display device |
| US11662583B2 (en) * | 2020-10-15 | 2023-05-30 | Google Llc | Optical combiner with integrated prescription optical correction and method of manufacturing the same |
| CN115053165B (en) * | 2020-12-25 | 2023-11-10 | 京东方科技集团股份有限公司 | Optical system and display device |
| CN113204119A (en) * | 2021-04-30 | 2021-08-03 | 歌尔股份有限公司 | Cemented lens group and head-mounted display device |
| WO2024018322A1 (en) * | 2022-07-22 | 2024-01-25 | 株式会社半導体エネルギー研究所 | Electronic apparatus |
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| CN108027507A (en) * | 2015-10-12 | 2018-05-11 | 英特尔公司 | Adjustable interpupillary distance wearable display |
| WO2019084322A1 (en) * | 2017-10-26 | 2019-05-02 | Magic Leap, Inc. | Augmented reality display having liquid crystal variable focus element and roll-to-roll method and apparatus for forming the same |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3985427A1 (en) | 2022-04-20 |
| CN110426853A (en) | 2019-11-08 |
| US20220283437A1 (en) | 2022-09-08 |
| WO2021017885A1 (en) | 2021-02-04 |
| EP3985427A4 (en) | 2022-08-31 |
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